Which of the following scenarios requires the use of 2 iodine tablets?

To determine the correct scenario for the use of two iodine tablets, it's important to understand the distinctions between the purification needs of clear versus cloudy water and the volume of water being purified.

When purifying water, the clarity of the water plays a critical role in the effectiveness of iodine treatment. Clear water generally requires fewer iodine tablets for purification because it contains fewer potential contaminants. In contrast, cloudy water typically contains a higher level of impurities, suspended particles, and possibly pathogens, which makes it necessary to use a greater amount of iodine to ensure effective disinfection.

In the specific context of using iodine tablets, the guideline states that one tablet is adequate for purifying one quart of clear water, but when dealing with cloudy water, two tablets are required for the same volume. This is because the additional tablet helps account for the increased contamination load present in the cloudy water, thus providing an increased level of disinfection.

Therefore, purifying one quart of cloudy water necessitates the use of two iodine tablets to ensure that water is safe for consumption. This understanding underlines the importance of evaluating water quality and adjusting purification methods accordingly.